Introduction¶

CircuitPython driver for the MAX7219 LED matrix driver chip.

See here for the equivalent MicroPython driver.

Dependencies¶

This driver depends on:

Adafruit CircuitPython

Please ensure all dependencies are available on the CircuitPython filesystem. This is easily achieved by downloading the Adafruit library and driver bundle.

Installing from PyPI¶

On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally from PyPI. To install for current user:

pip3 install adafruit-circuitpython-max7219

To install system-wide (this may be required in some cases):

sudo pip3 install adafruit-circuitpython-max7219

To install in a virtual environment in your current project:

mkdir project-name && cd project-name
python3 -m venv .env
source .env/bin/activate
pip3 install adafruit-circuitpython-max7219

Usage Example¶

adafruit_max7219.Matrix8x8 Example¶

from adafruit_max7219 import matrices
from board import TX, RX, A2
import busio
import digitalio
import time

clk = RX
din = TX
cs = digitalio.DigitalInOut(A2)

spi = busio.SPI(clk, MOSI=din)
display = matrices.Matrix8x8(spi, cs)
while True:
    display.brightness(3)

    display.fill(1)
    display.pixel(3, 3)
    display.pixel(3, 4)
    display.pixel(4, 3)
    display.pixel(4, 4)
    display.show()
    time.sleep(3.0)

    display.clear_all()
    s = 'Hello, World!'
    for c in range(len(s)*8):
        display.fill(0)
        display.text(s,-c,0)
        display.show()
        time.sleep(0.25)

adafruit_max7219.BCDDigits Example¶

from adafruit_max7219 import bcddigits
from board import TX, RX, A2
import bitbangio
import digitalio

clk = RX
din = TX
cs = digitalio.DigitalInOut(A2)

spi = bitbangio.SPI(clk, MOSI=din)
display = bcddigits.BCDDigits(spi, cs, nDigits=8)
display.clear_all()
display.show_str(0,'{:9.2f}'.format(-1234.56))
display.show()

Contributing¶

Contributions are welcome! Please read our Code of Conduct before contributing to help this project stay welcoming.

Documentation¶

For information on building library documentation, please check out this guide.

Table of Contents¶

Examples

Simple test

API Reference